Improvement in pipe-joints



W. C. ALLISON. Pipe-Joints.

No. 214,8;4. n Patented April'29, 1879.

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N.FETERS, PHDTD LITMOGR PH UNITED STATES PATENT FFICE WILLIAM C.ALLISON, OF PHILADELPHIA, PENNSYLVANIA.

IM PROVEM ENT IN PIPE-JOINTS.

Specification forming part of. Letters Patent No. 214,804, dated April29, 1879; application filed January 28, 1879.

To all whom it may concern:

Be it known that I, WILLIAM U. ALLrsoN, of the city and county ofPhiladelphia, and State of Pennsylvania, have invented a new and usefulJoint for Metal Pipes, of which the following is a clear, full, andexact description, reference heilig had to the accompanying drawings,which form part of this specification, and in which are represented twoforms of my improved joint.

My invention has for its object the construction ofajoint for metalpipes, which is designed as an improvement on other formsot` joints nowin use 5 to which end it consists in so expanding and compressing theend of a piece of pipe, technically known in the art as upsetting as toadapt it to receive the end of another piece of pipe, to which it may beiirmly connected by a suitable screw-thread.

I am aware that boiler tubes and pipes have heretofore been upset attheir ends to increase the wearing-surface thereof.; but pipes withupset and expanded ends for receiving screwthreads have not been used.

The object of upsetting the ends of the pipe is to secure increasedstrength in those parts which in other forms of joints are the weakest.

In the accompanying drawings, in which similar` letters of referenceindicate like parts,

Figure l represents the first form of my irnproved joint; Fig. 2, thesecond form of my improved joint; and Figs. 3 and 4L represent the oldforms of joints.

In Fig. 1 the pipe-joint, as shown, is made of light metal, and bothmale, a, and female, b, are upset, the female, b, being expanded andupset sufficiently to admit the screwthread being out, and leaving theoutside equal to, or even thicker, if necessary, than, the other partsof the pipe.

Where the pipe is sutliciently strong to admitof a thread, as shown onthe male, a, in Fig. 2, it is only necessary to expand and upset thefemale, b, to make it equal, or stronger than, any other part of thepipe. The usual way of coupling pipe of that thickness is shown in Fig.3, by means of a socket.

4In Fig. 4 is shown the usual way of making a joint. The female pipe bisexpanded and not upset, and by so doing reduces the thickness of metal,so that after cutting the screw-thread leaves lthe joint much. weakerthan the other parts ot' the pipe.

The pipes, as shown in Figs. l and 2, are connected by a taper orvanishing screwthread at the upper end, o,- for which I was grantedLetters Patent of the United States, July 12, 1870. 1 In connection withthe upsetting of the pipe, I make a taper or vanishing thread on the endof the male pipe a, and counterpart of the female pipe b at d, as shownin Figs. l and 2, increasing the strength of the pipe at that point.

. Having thus described my invention, what I claim, and desire to secureby Letters Patent of the United States, is-

1. A metal pipe having one of the ends up-l set and expanded, and theother end upset, adapting it to be joined to another pipe by ascrew-thread, substantially as described.

2. The combination of a male and female pipe, the former being upset,and the latter upset and expanded, and provided with vanishingscrew-threads, substantially as and for the purpose set forth. 4 v

3. A metal pipe having one end upset and expanded, and the other end notupset, both of lsaid ends'beiug adapted to be joined to another pipe byscrewhreads, substantially as described.

4. In apipe-joint, the combination of a male and female pipe providedwith screw-threads, j

the latter being upset and expanded, and the former not upset,substantially as and for the purpose described.

In testimony that I claim the foregoing as my own I affix my signaturein the presence of two witnesses.

W. G. ALLISON.

Witnesses:

JOHN It. BENNETT, R. S. CHILD, Jr.

